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author | 2017-08-07 11:39:39 +0800 | |
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committer | 2017-08-07 11:39:39 +0800 | |
commit | 21d72c4a80fe2937d0c4ddd20624b27adbcd989b (patch) | |
tree | e5013ee12f74f8452e01cbff16e7b0158bc456cb /common/src/main/webapp/usageguide/appserver/node_modules/mongodb/lib/gridfs/grid_store.js | |
parent | f533e73e2ae32e010b16abdcf7985abaf31ab843 (diff) |
Upload the ESR GUI seed code
Issue-ID: AAI-68
Change-Id: Ia50ce0570c2fabecd77199d4e8454f56fe587c4e
Signed-off-by: lizi00164331 <li.zi30@zte.com.cn>
Diffstat (limited to 'common/src/main/webapp/usageguide/appserver/node_modules/mongodb/lib/gridfs/grid_store.js')
-rw-r--r-- | common/src/main/webapp/usageguide/appserver/node_modules/mongodb/lib/gridfs/grid_store.js | 1951 |
1 files changed, 1951 insertions, 0 deletions
diff --git a/common/src/main/webapp/usageguide/appserver/node_modules/mongodb/lib/gridfs/grid_store.js b/common/src/main/webapp/usageguide/appserver/node_modules/mongodb/lib/gridfs/grid_store.js new file mode 100644 index 0000000..27dd8ce --- /dev/null +++ b/common/src/main/webapp/usageguide/appserver/node_modules/mongodb/lib/gridfs/grid_store.js @@ -0,0 +1,1951 @@ +"use strict"; + +/** + * @fileOverview GridFS is a tool for MongoDB to store files to the database. + * Because of the restrictions of the object size the database can hold, a + * facility to split a file into several chunks is needed. The {@link GridStore} + * class offers a simplified api to interact with files while managing the + * chunks of split files behind the scenes. More information about GridFS can be + * found <a href="http://www.mongodb.org/display/DOCS/GridFS">here</a>. + * + * @example + * var MongoClient = require('mongodb').MongoClient, + * GridStore = require('mongodb').GridStore, + * ObjectID = require('mongodb').ObjectID, + * test = require('assert'); + * + * // Connection url + * var url = 'mongodb://localhost:27017/test'; + * // Connect using MongoClient + * MongoClient.connect(url, function(err, db) { + * var gridStore = new GridStore(db, null, "w"); + * gridStore.open(function(err, gridStore) { + * gridStore.write("hello world!", function(err, gridStore) { + * gridStore.close(function(err, result) { + * + * // Let's read the file using object Id + * GridStore.read(db, result._id, function(err, data) { + * test.equal('hello world!', data); + * db.close(); + * test.done(); + * }); + * }); + * }); + * }); + * }); + */ +var Chunk = require('./chunk'), + ObjectID = require('mongodb-core').BSON.ObjectID, + ReadPreference = require('../read_preference'), + Buffer = require('buffer').Buffer, + Collection = require('../collection'), + fs = require('fs'), + f = require('util').format, + util = require('util'), + Define = require('../metadata'), + MongoError = require('mongodb-core').MongoError, + inherits = util.inherits, + Duplex = require('stream').Duplex || require('readable-stream').Duplex, + shallowClone = require('../utils').shallowClone; + +var REFERENCE_BY_FILENAME = 0, + REFERENCE_BY_ID = 1; + +/** + * Namespace provided by the mongodb-core and node.js + * @external Duplex + */ + +/** + * Create a new GridStore instance + * + * Modes + * - **"r"** - read only. This is the default mode. + * - **"w"** - write in truncate mode. Existing data will be overwriten. + * + * @class + * @param {Db} db A database instance to interact with. + * @param {object} [id] optional unique id for this file + * @param {string} [filename] optional filename for this file, no unique constrain on the field + * @param {string} mode set the mode for this file. + * @param {object} [options=null] Optional settings. + * @param {(number|string)} [options.w=null] The write concern. + * @param {number} [options.wtimeout=null] The write concern timeout. + * @param {boolean} [options.j=false] Specify a journal write concern. + * @param {boolean} [options.fsync=false] Specify a file sync write concern. + * @param {string} [options.root=null] Root collection to use. Defaults to **{GridStore.DEFAULT_ROOT_COLLECTION}**. + * @param {string} [options.content_type=null] MIME type of the file. Defaults to **{GridStore.DEFAULT_CONTENT_TYPE}**. + * @param {number} [options.chunk_size=261120] Size for the chunk. Defaults to **{Chunk.DEFAULT_CHUNK_SIZE}**. + * @param {object} [options.metadata=null] Arbitrary data the user wants to store. + * @param {object} [options.promiseLibrary=null] A Promise library class the application wishes to use such as Bluebird, must be ES6 compatible + * @param {(ReadPreference|string)} [options.readPreference=null] The preferred read preference (ReadPreference.PRIMARY, ReadPreference.PRIMARY_PREFERRED, ReadPreference.SECONDARY, ReadPreference.SECONDARY_PREFERRED, ReadPreference.NEAREST). + * @property {number} chunkSize Get the gridstore chunk size. + * @property {number} md5 The md5 checksum for this file. + * @property {number} chunkNumber The current chunk number the gridstore has materialized into memory + * @return {GridStore} a GridStore instance. + * @deprecated Use GridFSBucket API instead + */ +var GridStore = function GridStore(db, id, filename, mode, options) { + if(!(this instanceof GridStore)) return new GridStore(db, id, filename, mode, options); + this.db = db; + + // Handle options + if(typeof options === 'undefined') options = {}; + // Handle mode + if(typeof mode === 'undefined') { + mode = filename; + filename = undefined; + } else if(typeof mode == 'object') { + options = mode; + mode = filename; + filename = undefined; + } + + if(id && id._bsontype == 'ObjectID') { + this.referenceBy = REFERENCE_BY_ID; + this.fileId = id; + this.filename = filename; + } else if(typeof filename == 'undefined') { + this.referenceBy = REFERENCE_BY_FILENAME; + this.filename = id; + if (mode.indexOf('w') != null) { + this.fileId = new ObjectID(); + } + } else { + this.referenceBy = REFERENCE_BY_ID; + this.fileId = id; + this.filename = filename; + } + + // Set up the rest + this.mode = mode == null ? "r" : mode; + this.options = options || {}; + + // Opened + this.isOpen = false; + + // Set the root if overridden + this.root = this.options['root'] == null ? GridStore.DEFAULT_ROOT_COLLECTION : this.options['root']; + this.position = 0; + this.readPreference = this.options.readPreference || db.options.readPreference || ReadPreference.PRIMARY; + this.writeConcern = _getWriteConcern(db, this.options); + // Set default chunk size + this.internalChunkSize = this.options['chunkSize'] == null ? Chunk.DEFAULT_CHUNK_SIZE : this.options['chunkSize']; + + // Get the promiseLibrary + var promiseLibrary = this.options.promiseLibrary; + + // No promise library selected fall back + if(!promiseLibrary) { + promiseLibrary = typeof global.Promise == 'function' ? + global.Promise : require('es6-promise').Promise; + } + + // Set the promiseLibrary + this.promiseLibrary = promiseLibrary; + + Object.defineProperty(this, "chunkSize", { enumerable: true + , get: function () { + return this.internalChunkSize; + } + , set: function(value) { + if(!(this.mode[0] == "w" && this.position == 0 && this.uploadDate == null)) { + this.internalChunkSize = this.internalChunkSize; + } else { + this.internalChunkSize = value; + } + } + }); + + Object.defineProperty(this, "md5", { enumerable: true + , get: function () { + return this.internalMd5; + } + }); + + Object.defineProperty(this, "chunkNumber", { enumerable: true + , get: function () { + return this.currentChunk && this.currentChunk.chunkNumber ? this.currentChunk.chunkNumber : null; + } + }); +} + +var define = GridStore.define = new Define('Gridstore', GridStore, true); + +/** + * The callback format for the Gridstore.open method + * @callback GridStore~openCallback + * @param {MongoError} error An error instance representing the error during the execution. + * @param {GridStore} gridStore The GridStore instance if the open method was successful. + */ + +/** + * Opens the file from the database and initialize this object. Also creates a + * new one if file does not exist. + * + * @method + * @param {GridStore~openCallback} [callback] this will be called after executing this method + * @return {Promise} returns Promise if no callback passed + * @deprecated Use GridFSBucket API instead + */ +GridStore.prototype.open = function(callback) { + var self = this; + if( this.mode != "w" && this.mode != "w+" && this.mode != "r"){ + throw MongoError.create({message: "Illegal mode " + this.mode, driver:true}); + } + + // We provided a callback leg + if(typeof callback == 'function') return open(self, callback); + // Return promise + return new self.promiseLibrary(function(resolve, reject) { + open(self, function(err, store) { + if(err) return reject(err); + resolve(store); + }) + }); +}; + +var open = function(self, callback) { + // Get the write concern + var writeConcern = _getWriteConcern(self.db, self.options); + + // If we are writing we need to ensure we have the right indexes for md5's + if((self.mode == "w" || self.mode == "w+")) { + // Get files collection + var collection = self.collection(); + // Put index on filename + collection.ensureIndex([['filename', 1]], writeConcern, function() { + // Get chunk collection + var chunkCollection = self.chunkCollection(); + // Make an unique index for compatibility with mongo-cxx-driver:legacy + var chunkIndexOptions = shallowClone(writeConcern); + chunkIndexOptions.unique = true; + // Ensure index on chunk collection + chunkCollection.ensureIndex([['files_id', 1], ['n', 1]], chunkIndexOptions, function() { + // Open the connection + _open(self, writeConcern, function(err, r) { + if(err) return callback(err); + self.isOpen = true; + callback(err, r); + }); + }); + }); + } else { + // Open the gridstore + _open(self, writeConcern, function(err, r) { + if(err) return callback(err); + self.isOpen = true; + callback(err, r); + }); + } +} + +// Push the definition for open +define.classMethod('open', {callback: true, promise:true}); + +/** + * Verify if the file is at EOF. + * + * @method + * @return {boolean} true if the read/write head is at the end of this file. + * @deprecated Use GridFSBucket API instead + */ +GridStore.prototype.eof = function() { + return this.position == this.length ? true : false; +} + +define.classMethod('eof', {callback: false, promise:false, returns: [Boolean]}); + +/** + * The callback result format. + * @callback GridStore~resultCallback + * @param {MongoError} error An error instance representing the error during the execution. + * @param {object} result The result from the callback. + */ + +/** + * Retrieves a single character from this file. + * + * @method + * @param {GridStore~resultCallback} [callback] this gets called after this method is executed. Passes null to the first parameter and the character read to the second or null to the second if the read/write head is at the end of the file. + * @return {Promise} returns Promise if no callback passed + * @deprecated Use GridFSBucket API instead + */ +GridStore.prototype.getc = function(callback) { + var self = this; + // We provided a callback leg + if(typeof callback == 'function') return eof(self, callback); + // Return promise + return new self.promiseLibrary(function(resolve, reject) { + eof(self, function(err, r) { + if(err) return reject(err); + resolve(r); + }) + }); +} + +var eof = function(self, callback) { + if(self.eof()) { + callback(null, null); + } else if(self.currentChunk.eof()) { + nthChunk(self, self.currentChunk.chunkNumber + 1, function(err, chunk) { + self.currentChunk = chunk; + self.position = self.position + 1; + callback(err, self.currentChunk.getc()); + }); + } else { + self.position = self.position + 1; + callback(null, self.currentChunk.getc()); + } +} + +define.classMethod('getc', {callback: true, promise:true}); + +/** + * Writes a string to the file with a newline character appended at the end if + * the given string does not have one. + * + * @method + * @param {string} string the string to write. + * @param {GridStore~resultCallback} [callback] this will be called after executing this method. The first parameter will contain null and the second one will contain a reference to this object. + * @return {Promise} returns Promise if no callback passed + * @deprecated Use GridFSBucket API instead + */ +GridStore.prototype.puts = function(string, callback) { + var self = this; + var finalString = string.match(/\n$/) == null ? string + "\n" : string; + // We provided a callback leg + if(typeof callback == 'function') return this.write(finalString, callback); + // Return promise + return new self.promiseLibrary(function(resolve, reject) { + self.write(finalString, function(err, r) { + if(err) return reject(err); + resolve(r); + }) + }); +} + +define.classMethod('puts', {callback: true, promise:true}); + +/** + * Return a modified Readable stream including a possible transform method. + * + * @method + * @return {GridStoreStream} + * @deprecated Use GridFSBucket API instead + */ +GridStore.prototype.stream = function() { + return new GridStoreStream(this); +} + +define.classMethod('stream', {callback: false, promise:false, returns: [GridStoreStream]}); + +/** + * Writes some data. This method will work properly only if initialized with mode "w" or "w+". + * + * @method + * @param {(string|Buffer)} data the data to write. + * @param {boolean} [close] closes this file after writing if set to true. + * @param {GridStore~resultCallback} [callback] this will be called after executing this method. The first parameter will contain null and the second one will contain a reference to this object. + * @return {Promise} returns Promise if no callback passed + * @deprecated Use GridFSBucket API instead + */ +GridStore.prototype.write = function write(data, close, callback) { + var self = this; + // We provided a callback leg + if(typeof callback == 'function') return _writeNormal(this, data, close, callback); + // Return promise + return new self.promiseLibrary(function(resolve, reject) { + _writeNormal(self, data, close, function(err, r) { + if(err) return reject(err); + resolve(r); + }) + }); +} + +define.classMethod('write', {callback: true, promise:true}); + +/** + * Handles the destroy part of a stream + * + * @method + * @result {null} + * @deprecated Use GridFSBucket API instead + */ +GridStore.prototype.destroy = function destroy() { + // close and do not emit any more events. queued data is not sent. + if(!this.writable) return; + this.readable = false; + if(this.writable) { + this.writable = false; + this._q.length = 0; + this.emit('close'); + } +} + +define.classMethod('destroy', {callback: false, promise:false}); + +/** + * Stores a file from the file system to the GridFS database. + * + * @method + * @param {(string|Buffer|FileHandle)} file the file to store. + * @param {GridStore~resultCallback} [callback] this will be called after executing this method. The first parameter will contain null and the second one will contain a reference to this object. + * @return {Promise} returns Promise if no callback passed + * @deprecated Use GridFSBucket API instead + */ +GridStore.prototype.writeFile = function (file, callback) { + var self = this; + // We provided a callback leg + if(typeof callback == 'function') return writeFile(self, file, callback); + // Return promise + return new self.promiseLibrary(function(resolve, reject) { + writeFile(self, file, function(err, r) { + if(err) return reject(err); + resolve(r); + }) + }); +}; + +var writeFile = function(self, file, callback) { + if (typeof file === 'string') { + fs.open(file, 'r', function (err, fd) { + if(err) return callback(err); + self.writeFile(fd, callback); + }); + return; + } + + self.open(function (err, self) { + if(err) return callback(err, self); + + fs.fstat(file, function (err, stats) { + if(err) return callback(err, self); + + var offset = 0; + var index = 0; + + // Write a chunk + var writeChunk = function() { + fs.read(file, self.chunkSize, offset, 'binary', function(err, data, bytesRead) { + if(err) return callback(err, self); + + offset = offset + bytesRead; + + // Create a new chunk for the data + var chunk = new Chunk(self, {n:index++}, self.writeConcern); + chunk.write(data, function(err, chunk) { + if(err) return callback(err, self); + + chunk.save({}, function(err) { + if(err) return callback(err, self); + + self.position = self.position + data.length; + + // Point to current chunk + self.currentChunk = chunk; + + if(offset >= stats.size) { + fs.close(file); + self.close(function(err) { + if(err) return callback(err, self); + return callback(null, self); + }); + } else { + return process.nextTick(writeChunk); + } + }); + }); + }); + } + + // Process the first write + process.nextTick(writeChunk); + }); + }); +} + +define.classMethod('writeFile', {callback: true, promise:true}); + +/** + * Saves this file to the database. This will overwrite the old entry if it + * already exists. This will work properly only if mode was initialized to + * "w" or "w+". + * + * @method + * @param {GridStore~resultCallback} [callback] this will be called after executing this method. The first parameter will contain null and the second one will contain a reference to this object. + * @return {Promise} returns Promise if no callback passed + * @deprecated Use GridFSBucket API instead + */ +GridStore.prototype.close = function(callback) { + var self = this; + // We provided a callback leg + if(typeof callback == 'function') return close(self, callback); + // Return promise + return new self.promiseLibrary(function(resolve, reject) { + close(self, function(err, r) { + if(err) return reject(err); + resolve(r); + }) + }); +}; + +var close = function(self, callback) { + if(self.mode[0] == "w") { + // Set up options + var options = self.writeConcern; + + if(self.currentChunk != null && self.currentChunk.position > 0) { + self.currentChunk.save({}, function(err) { + if(err && typeof callback == 'function') return callback(err); + + self.collection(function(err, files) { + if(err && typeof callback == 'function') return callback(err); + + // Build the mongo object + if(self.uploadDate != null) { + buildMongoObject(self, function(err, mongoObject) { + if(err) { + if(typeof callback == 'function') return callback(err); else throw err; + } + + files.save(mongoObject, options, function(err) { + if(typeof callback == 'function') + callback(err, mongoObject); + }); + }); + } else { + self.uploadDate = new Date(); + buildMongoObject(self, function(err, mongoObject) { + if(err) { + if(typeof callback == 'function') return callback(err); else throw err; + } + + files.save(mongoObject, options, function(err) { + if(typeof callback == 'function') + callback(err, mongoObject); + }); + }); + } + }); + }); + } else { + self.collection(function(err, files) { + if(err && typeof callback == 'function') return callback(err); + + self.uploadDate = new Date(); + buildMongoObject(self, function(err, mongoObject) { + if(err) { + if(typeof callback == 'function') return callback(err); else throw err; + } + + files.save(mongoObject, options, function(err) { + if(typeof callback == 'function') + callback(err, mongoObject); + }); + }); + }); + } + } else if(self.mode[0] == "r") { + if(typeof callback == 'function') + callback(null, null); + } else { + if(typeof callback == 'function') + callback(MongoError.create({message: f("Illegal mode %s", self.mode), driver:true})); + } +} + +define.classMethod('close', {callback: true, promise:true}); + +/** + * The collection callback format. + * @callback GridStore~collectionCallback + * @param {MongoError} error An error instance representing the error during the execution. + * @param {Collection} collection The collection from the command execution. + */ + +/** + * Retrieve this file's chunks collection. + * + * @method + * @param {GridStore~collectionCallback} callback the command callback. + * @return {Collection} + * @deprecated Use GridFSBucket API instead + */ +GridStore.prototype.chunkCollection = function(callback) { + if(typeof callback == 'function') + return this.db.collection((this.root + ".chunks"), callback); + return this.db.collection((this.root + ".chunks")); +}; + +define.classMethod('chunkCollection', {callback: true, promise:false, returns: [Collection]}); + +/** + * Deletes all the chunks of this file in the database. + * + * @method + * @param {GridStore~resultCallback} [callback] the command callback. + * @return {Promise} returns Promise if no callback passed + * @deprecated Use GridFSBucket API instead + */ +GridStore.prototype.unlink = function(callback) { + var self = this; + // We provided a callback leg + if(typeof callback == 'function') return unlink(self, callback); + // Return promise + return new self.promiseLibrary(function(resolve, reject) { + unlink(self, function(err, r) { + if(err) return reject(err); + resolve(r); + }) + }); +}; + +var unlink = function(self, callback) { + deleteChunks(self, function(err) { + if(err!==null) { + err.message = "at deleteChunks: " + err.message; + return callback(err); + } + + self.collection(function(err, collection) { + if(err!==null) { + err.message = "at collection: " + err.message; + return callback(err); + } + + collection.remove({'_id':self.fileId}, self.writeConcern, function(err) { + callback(err, self); + }); + }); + }); +} + +define.classMethod('unlink', {callback: true, promise:true}); + +/** + * Retrieves the file collection associated with this object. + * + * @method + * @param {GridStore~collectionCallback} callback the command callback. + * @return {Collection} + * @deprecated Use GridFSBucket API instead + */ +GridStore.prototype.collection = function(callback) { + if(typeof callback == 'function') + this.db.collection(this.root + ".files", callback); + return this.db.collection(this.root + ".files"); +}; + +define.classMethod('collection', {callback: true, promise:false, returns: [Collection]}); + +/** + * The readlines callback format. + * @callback GridStore~readlinesCallback + * @param {MongoError} error An error instance representing the error during the execution. + * @param {string[]} strings The array of strings returned. + */ + +/** + * Read the entire file as a list of strings splitting by the provided separator. + * + * @method + * @param {string} [separator] The character to be recognized as the newline separator. + * @param {GridStore~readlinesCallback} [callback] the command callback. + * @return {Promise} returns Promise if no callback passed + * @deprecated Use GridFSBucket API instead + */ +GridStore.prototype.readlines = function(separator, callback) { + var self = this; + var args = Array.prototype.slice.call(arguments, 0); + callback = args.pop(); + if(typeof callback != 'function') args.push(callback); + separator = args.length ? args.shift() : "\n"; + separator = separator || "\n"; + + // We provided a callback leg + if(typeof callback == 'function') return readlines(self, separator, callback); + + // Return promise + return new self.promiseLibrary(function(resolve, reject) { + readlines(self, separator, function(err, r) { + if(err) return reject(err); + resolve(r); + }) + }); +}; + +var readlines = function(self, separator, callback) { + self.read(function(err, data) { + if(err) return callback(err); + + var items = data.toString().split(separator); + items = items.length > 0 ? items.splice(0, items.length - 1) : []; + for(var i = 0; i < items.length; i++) { + items[i] = items[i] + separator; + } + + callback(null, items); + }); +} + +define.classMethod('readlines', {callback: true, promise:true}); + +/** + * Deletes all the chunks of this file in the database if mode was set to "w" or + * "w+" and resets the read/write head to the initial position. + * + * @method + * @param {GridStore~resultCallback} [callback] this will be called after executing this method. The first parameter will contain null and the second one will contain a reference to this object. + * @return {Promise} returns Promise if no callback passed + * @deprecated Use GridFSBucket API instead + */ +GridStore.prototype.rewind = function(callback) { + var self = this; + // We provided a callback leg + if(typeof callback == 'function') return rewind(self, callback); + // Return promise + return new self.promiseLibrary(function(resolve, reject) { + rewind(self, function(err, r) { + if(err) return reject(err); + resolve(r); + }) + }); +}; + +var rewind = function(self, callback) { + if(self.currentChunk.chunkNumber != 0) { + if(self.mode[0] == "w") { + deleteChunks(self, function(err) { + if(err) return callback(err); + self.currentChunk = new Chunk(self, {'n': 0}, self.writeConcern); + self.position = 0; + callback(null, self); + }); + } else { + self.currentChunk(0, function(err, chunk) { + if(err) return callback(err); + self.currentChunk = chunk; + self.currentChunk.rewind(); + self.position = 0; + callback(null, self); + }); + } + } else { + self.currentChunk.rewind(); + self.position = 0; + callback(null, self); + } +} + +define.classMethod('rewind', {callback: true, promise:true}); + +/** + * The read callback format. + * @callback GridStore~readCallback + * @param {MongoError} error An error instance representing the error during the execution. + * @param {Buffer} data The data read from the GridStore object + */ + +/** + * Retrieves the contents of this file and advances the read/write head. Works with Buffers only. + * + * There are 3 signatures for this method: + * + * (callback) + * (length, callback) + * (length, buffer, callback) + * + * @method + * @param {number} [length] the number of characters to read. Reads all the characters from the read/write head to the EOF if not specified. + * @param {(string|Buffer)} [buffer] a string to hold temporary data. This is used for storing the string data read so far when recursively calling this method. + * @param {GridStore~readCallback} [callback] the command callback. + * @return {Promise} returns Promise if no callback passed + * @deprecated Use GridFSBucket API instead + */ +GridStore.prototype.read = function(length, buffer, callback) { + var self = this; + + var args = Array.prototype.slice.call(arguments, 0); + callback = args.pop(); + if(typeof callback != 'function') args.push(callback); + length = args.length ? args.shift() : null; + buffer = args.length ? args.shift() : null; + // We provided a callback leg + if(typeof callback == 'function') return read(self, length, buffer, callback); + // Return promise + return new self.promiseLibrary(function(resolve, reject) { + read(self, length, buffer, function(err, r) { + if(err) return reject(err); + resolve(r); + }) + }); +} + +var read = function(self, length, buffer, callback) { + // The data is a c-terminated string and thus the length - 1 + var finalLength = length == null ? self.length - self.position : length; + var finalBuffer = buffer == null ? new Buffer(finalLength) : buffer; + // Add a index to buffer to keep track of writing position or apply current index + finalBuffer._index = buffer != null && buffer._index != null ? buffer._index : 0; + + if((self.currentChunk.length() - self.currentChunk.position + finalBuffer._index) >= finalLength) { + var slice = self.currentChunk.readSlice(finalLength - finalBuffer._index); + // Copy content to final buffer + slice.copy(finalBuffer, finalBuffer._index); + // Update internal position + self.position = self.position + finalBuffer.length; + // Check if we don't have a file at all + if(finalLength == 0 && finalBuffer.length == 0) return callback(MongoError.create({message: "File does not exist", driver:true}), null); + // Else return data + return callback(null, finalBuffer); + } + + // Read the next chunk + slice = self.currentChunk.readSlice(self.currentChunk.length() - self.currentChunk.position); + // Copy content to final buffer + slice.copy(finalBuffer, finalBuffer._index); + // Update index position + finalBuffer._index += slice.length; + + // Load next chunk and read more + nthChunk(self, self.currentChunk.chunkNumber + 1, function(err, chunk) { + if(err) return callback(err); + + if(chunk.length() > 0) { + self.currentChunk = chunk; + self.read(length, finalBuffer, callback); + } else { + if(finalBuffer._index > 0) { + callback(null, finalBuffer) + } else { + callback(MongoError.create({message: "no chunks found for file, possibly corrupt", driver:true}), null); + } + } + }); +} + +define.classMethod('read', {callback: true, promise:true}); + +/** + * The tell callback format. + * @callback GridStore~tellCallback + * @param {MongoError} error An error instance representing the error during the execution. + * @param {number} position The current read position in the GridStore. + */ + +/** + * Retrieves the position of the read/write head of this file. + * + * @method + * @param {number} [length] the number of characters to read. Reads all the characters from the read/write head to the EOF if not specified. + * @param {(string|Buffer)} [buffer] a string to hold temporary data. This is used for storing the string data read so far when recursively calling this method. + * @param {GridStore~tellCallback} [callback] the command callback. + * @return {Promise} returns Promise if no callback passed + * @deprecated Use GridFSBucket API instead + */ +GridStore.prototype.tell = function(callback) { + var self = this; + // We provided a callback leg + if(typeof callback == 'function') return callback(null, this.position); + // Return promise + return new self.promiseLibrary(function(resolve) { + resolve(self.position); + }); +}; + +define.classMethod('tell', {callback: true, promise:true}); + +/** + * The tell callback format. + * @callback GridStore~gridStoreCallback + * @param {MongoError} error An error instance representing the error during the execution. + * @param {GridStore} gridStore The gridStore. + */ + +/** + * Moves the read/write head to a new location. + * + * There are 3 signatures for this method + * + * Seek Location Modes + * - **GridStore.IO_SEEK_SET**, **(default)** set the position from the start of the file. + * - **GridStore.IO_SEEK_CUR**, set the position from the current position in the file. + * - **GridStore.IO_SEEK_END**, set the position from the end of the file. + * + * @method + * @param {number} [position] the position to seek to + * @param {number} [seekLocation] seek mode. Use one of the Seek Location modes. + * @param {GridStore~gridStoreCallback} [callback] the command callback. + * @return {Promise} returns Promise if no callback passed + * @deprecated Use GridFSBucket API instead + */ +GridStore.prototype.seek = function(position, seekLocation, callback) { + var self = this; + + var args = Array.prototype.slice.call(arguments, 1); + callback = args.pop(); + if(typeof callback != 'function') args.push(callback); + seekLocation = args.length ? args.shift() : null; + + // We provided a callback leg + if(typeof callback == 'function') return seek(self, position, seekLocation, callback); + // Return promise + return new self.promiseLibrary(function(resolve, reject) { + seek(self, position, seekLocation, function(err, r) { + if(err) return reject(err); + resolve(r); + }) + }); +} + +var seek = function(self, position, seekLocation, callback) { + // Seek only supports read mode + if(self.mode != 'r') { + return callback(MongoError.create({message: "seek is only supported for mode r", driver:true})) + } + + var seekLocationFinal = seekLocation == null ? GridStore.IO_SEEK_SET : seekLocation; + var finalPosition = position; + var targetPosition = 0; + + // Calculate the position + if(seekLocationFinal == GridStore.IO_SEEK_CUR) { + targetPosition = self.position + finalPosition; + } else if(seekLocationFinal == GridStore.IO_SEEK_END) { + targetPosition = self.length + finalPosition; + } else { + targetPosition = finalPosition; + } + + // Get the chunk + var newChunkNumber = Math.floor(targetPosition/self.chunkSize); + var seekChunk = function() { + nthChunk(self, newChunkNumber, function(err, chunk) { + if(err) return callback(err, null); + if(chunk == null) return callback(new Error('no chunk found')); + + // Set the current chunk + self.currentChunk = chunk; + self.position = targetPosition; + self.currentChunk.position = (self.position % self.chunkSize); + callback(err, self); + }); + }; + + seekChunk(); +} + +define.classMethod('seek', {callback: true, promise:true}); + +/** + * @ignore + */ +var _open = function(self, options, callback) { + var collection = self.collection(); + // Create the query + var query = self.referenceBy == REFERENCE_BY_ID ? {_id:self.fileId} : {filename:self.filename}; + query = null == self.fileId && self.filename == null ? null : query; + options.readPreference = self.readPreference; + + // Fetch the chunks + if(query != null) { + collection.findOne(query, options, function(err, doc) { + if(err) return error(err); + + // Check if the collection for the files exists otherwise prepare the new one + if(doc != null) { + self.fileId = doc._id; + // Prefer a new filename over the existing one if this is a write + self.filename = ((self.mode == 'r') || (self.filename == undefined)) ? doc.filename : self.filename; + self.contentType = doc.contentType; + self.internalChunkSize = doc.chunkSize; + self.uploadDate = doc.uploadDate; + self.aliases = doc.aliases; + self.length = doc.length; + self.metadata = doc.metadata; + self.internalMd5 = doc.md5; + } else if (self.mode != 'r') { + self.fileId = self.fileId == null ? new ObjectID() : self.fileId; + self.contentType = GridStore.DEFAULT_CONTENT_TYPE; + self.internalChunkSize = self.internalChunkSize == null ? Chunk.DEFAULT_CHUNK_SIZE : self.internalChunkSize; + self.length = 0; + } else { + self.length = 0; + var txtId = self.fileId._bsontype == "ObjectID" ? self.fileId.toHexString() : self.fileId; + return error(MongoError.create({message: f("file with id %s not opened for writing", (self.referenceBy == REFERENCE_BY_ID ? txtId : self.filename)), driver:true}), self); + } + + // Process the mode of the object + if(self.mode == "r") { + nthChunk(self, 0, options, function(err, chunk) { + if(err) return error(err); + self.currentChunk = chunk; + self.position = 0; + callback(null, self); + }); + } else if(self.mode == "w" && doc) { + // Delete any existing chunks + deleteChunks(self, options, function(err) { + if(err) return error(err); + self.currentChunk = new Chunk(self, {'n':0}, self.writeConcern); + self.contentType = self.options['content_type'] == null ? self.contentType : self.options['content_type']; + self.internalChunkSize = self.options['chunk_size'] == null ? self.internalChunkSize : self.options['chunk_size']; + self.metadata = self.options['metadata'] == null ? self.metadata : self.options['metadata']; + self.aliases = self.options['aliases'] == null ? self.aliases : self.options['aliases']; + self.position = 0; + callback(null, self); + }); + } else if(self.mode == "w") { + self.currentChunk = new Chunk(self, {'n':0}, self.writeConcern); + self.contentType = self.options['content_type'] == null ? self.contentType : self.options['content_type']; + self.internalChunkSize = self.options['chunk_size'] == null ? self.internalChunkSize : self.options['chunk_size']; + self.metadata = self.options['metadata'] == null ? self.metadata : self.options['metadata']; + self.aliases = self.options['aliases'] == null ? self.aliases : self.options['aliases']; + self.position = 0; + callback(null, self); + } else if(self.mode == "w+") { + nthChunk(self, lastChunkNumber(self), options, function(err, chunk) { + if(err) return error(err); + // Set the current chunk + self.currentChunk = chunk == null ? new Chunk(self, {'n':0}, self.writeConcern) : chunk; + self.currentChunk.position = self.currentChunk.data.length(); + self.metadata = self.options['metadata'] == null ? self.metadata : self.options['metadata']; + self.aliases = self.options['aliases'] == null ? self.aliases : self.options['aliases']; + self.position = self.length; + callback(null, self); + }); + } + }); + } else { + // Write only mode + self.fileId = null == self.fileId ? new ObjectID() : self.fileId; + self.contentType = GridStore.DEFAULT_CONTENT_TYPE; + self.internalChunkSize = self.internalChunkSize == null ? Chunk.DEFAULT_CHUNK_SIZE : self.internalChunkSize; + self.length = 0; + + // No file exists set up write mode + if(self.mode == "w") { + // Delete any existing chunks + deleteChunks(self, options, function(err) { + if(err) return error(err); + self.currentChunk = new Chunk(self, {'n':0}, self.writeConcern); + self.contentType = self.options['content_type'] == null ? self.contentType : self.options['content_type']; + self.internalChunkSize = self.options['chunk_size'] == null ? self.internalChunkSize : self.options['chunk_size']; + self.metadata = self.options['metadata'] == null ? self.metadata : self.options['metadata']; + self.aliases = self.options['aliases'] == null ? self.aliases : self.options['aliases']; + self.position = 0; + callback(null, self); + }); + } else if(self.mode == "w+") { + nthChunk(self, lastChunkNumber(self), options, function(err, chunk) { + if(err) return error(err); + // Set the current chunk + self.currentChunk = chunk == null ? new Chunk(self, {'n':0}, self.writeConcern) : chunk; + self.currentChunk.position = self.currentChunk.data.length(); + self.metadata = self.options['metadata'] == null ? self.metadata : self.options['metadata']; + self.aliases = self.options['aliases'] == null ? self.aliases : self.options['aliases']; + self.position = self.length; + callback(null, self); + }); + } + } + + // only pass error to callback once + function error (err) { + if(error.err) return; + callback(error.err = err); + } +}; + +/** + * @ignore + */ +var writeBuffer = function(self, buffer, close, callback) { + if(typeof close === "function") { callback = close; close = null; } + var finalClose = typeof close == 'boolean' ? close : false; + + if(self.mode != "w") { + callback(MongoError.create({message: f("file with id %s not opened for writing", (self.referenceBy == REFERENCE_BY_ID ? self.referenceBy : self.filename)), driver:true}), null); + } else { + if(self.currentChunk.position + buffer.length >= self.chunkSize) { + // Write out the current Chunk and then keep writing until we have less data left than a chunkSize left + // to a new chunk (recursively) + var previousChunkNumber = self.currentChunk.chunkNumber; + var leftOverDataSize = self.chunkSize - self.currentChunk.position; + var firstChunkData = buffer.slice(0, leftOverDataSize); + var leftOverData = buffer.slice(leftOverDataSize); + // A list of chunks to write out + var chunksToWrite = [self.currentChunk.write(firstChunkData)]; + // If we have more data left than the chunk size let's keep writing new chunks + while(leftOverData.length >= self.chunkSize) { + // Create a new chunk and write to it + var newChunk = new Chunk(self, {'n': (previousChunkNumber + 1)}, self.writeConcern); + firstChunkData = leftOverData.slice(0, self.chunkSize); + leftOverData = leftOverData.slice(self.chunkSize); + // Update chunk number + previousChunkNumber = previousChunkNumber + 1; + // Write data + newChunk.write(firstChunkData); + // Push chunk to save list + chunksToWrite.push(newChunk); + } + + // Set current chunk with remaining data + self.currentChunk = new Chunk(self, {'n': (previousChunkNumber + 1)}, self.writeConcern); + // If we have left over data write it + if(leftOverData.length > 0) self.currentChunk.write(leftOverData); + + // Update the position for the gridstore + self.position = self.position + buffer.length; + // Total number of chunks to write + var numberOfChunksToWrite = chunksToWrite.length; + + for(var i = 0; i < chunksToWrite.length; i++) { + chunksToWrite[i].save({}, function(err) { + if(err) return callback(err); + + numberOfChunksToWrite = numberOfChunksToWrite - 1; + + if(numberOfChunksToWrite <= 0) { + // We care closing the file before returning + if(finalClose) { + return self.close(function(err) { + callback(err, self); + }); + } + + // Return normally + return callback(null, self); + } + }); + } + } else { + // Update the position for the gridstore + self.position = self.position + buffer.length; + // We have less data than the chunk size just write it and callback + self.currentChunk.write(buffer); + // We care closing the file before returning + if(finalClose) { + return self.close(function(err) { + callback(err, self); + }); + } + // Return normally + return callback(null, self); + } + } +}; + +/** + * Creates a mongoDB object representation of this object. + * + * <pre><code> + * { + * '_id' : , // {number} id for this file + * 'filename' : , // {string} name for this file + * 'contentType' : , // {string} mime type for this file + * 'length' : , // {number} size of this file? + * 'chunksize' : , // {number} chunk size used by this file + * 'uploadDate' : , // {Date} + * 'aliases' : , // {array of string} + * 'metadata' : , // {string} + * } + * </code></pre> + * + * @ignore + */ +var buildMongoObject = function(self, callback) { + // Calcuate the length + var mongoObject = { + '_id': self.fileId, + 'filename': self.filename, + 'contentType': self.contentType, + 'length': self.position ? self.position : 0, + 'chunkSize': self.chunkSize, + 'uploadDate': self.uploadDate, + 'aliases': self.aliases, + 'metadata': self.metadata + }; + + var md5Command = {filemd5:self.fileId, root:self.root}; + self.db.command(md5Command, function(err, results) { + if(err) return callback(err); + + mongoObject.md5 = results.md5; + callback(null, mongoObject); + }); +}; + +/** + * Gets the nth chunk of this file. + * @ignore + */ +var nthChunk = function(self, chunkNumber, options, callback) { + if(typeof options == 'function') { + callback = options; + options = {}; + } + + options = options || self.writeConcern; + options.readPreference = self.readPreference; + // Get the nth chunk + self.chunkCollection().findOne({'files_id':self.fileId, 'n':chunkNumber}, options, function(err, chunk) { + if(err) return callback(err); + + var finalChunk = chunk == null ? {} : chunk; + callback(null, new Chunk(self, finalChunk, self.writeConcern)); + }); +}; + +/** + * @ignore + */ +var lastChunkNumber = function(self) { + return Math.floor((self.length ? self.length - 1 : 0)/self.chunkSize); +}; + +/** + * Deletes all the chunks of this file in the database. + * + * @ignore + */ +var deleteChunks = function(self, options, callback) { + if(typeof options == 'function') { + callback = options; + options = {}; + } + + options = options || self.writeConcern; + + if(self.fileId != null) { + self.chunkCollection().remove({'files_id':self.fileId}, options, function(err) { + if(err) return callback(err, false); + callback(null, true); + }); + } else { + callback(null, true); + } +}; + +/** +* The collection to be used for holding the files and chunks collection. +* +* @classconstant DEFAULT_ROOT_COLLECTION +**/ +GridStore.DEFAULT_ROOT_COLLECTION = 'fs'; + +/** +* Default file mime type +* +* @classconstant DEFAULT_CONTENT_TYPE +**/ +GridStore.DEFAULT_CONTENT_TYPE = 'binary/octet-stream'; + +/** +* Seek mode where the given length is absolute. +* +* @classconstant IO_SEEK_SET +**/ +GridStore.IO_SEEK_SET = 0; + +/** +* Seek mode where the given length is an offset to the current read/write head. +* +* @classconstant IO_SEEK_CUR +**/ +GridStore.IO_SEEK_CUR = 1; + +/** +* Seek mode where the given length is an offset to the end of the file. +* +* @classconstant IO_SEEK_END +**/ +GridStore.IO_SEEK_END = 2; + +/** + * Checks if a file exists in the database. + * + * @method + * @static + * @param {Db} db the database to query. + * @param {string} name The name of the file to look for. + * @param {string} [rootCollection] The root collection that holds the files and chunks collection. Defaults to **{GridStore.DEFAULT_ROOT_COLLECTION}**. + * @param {object} [options=null] Optional settings. + * @param {(ReadPreference|string)} [options.readPreference=null] The preferred read preference (ReadPreference.PRIMARY, ReadPreference.PRIMARY_PREFERRED, ReadPreference.SECONDARY, ReadPreference.SECONDARY_PREFERRED, ReadPreference.NEAREST). + * @param {object} [options.promiseLibrary=null] A Promise library class the application wishes to use such as Bluebird, must be ES6 compatible + * @param {GridStore~resultCallback} [callback] result from exists. + * @return {Promise} returns Promise if no callback passed + * @deprecated Use GridFSBucket API instead + */ +GridStore.exist = function(db, fileIdObject, rootCollection, options, callback) { + var args = Array.prototype.slice.call(arguments, 2); + callback = args.pop(); + if(typeof callback != 'function') args.push(callback); + rootCollection = args.length ? args.shift() : null; + options = args.length ? args.shift() : {}; + options = options || {}; + + // Get the promiseLibrary + var promiseLibrary = options.promiseLibrary; + + // No promise library selected fall back + if(!promiseLibrary) { + promiseLibrary = typeof global.Promise == 'function' ? + global.Promise : require('es6-promise').Promise; + } + + // We provided a callback leg + if(typeof callback == 'function') return exists(db, fileIdObject, rootCollection, options, callback); + // Return promise + return new promiseLibrary(function(resolve, reject) { + exists(db, fileIdObject, rootCollection, options, function(err, r) { + if(err) return reject(err); + resolve(r); + }) + }); +}; + +var exists = function(db, fileIdObject, rootCollection, options, callback) { + // Establish read preference + var readPreference = options.readPreference || ReadPreference.PRIMARY; + // Fetch collection + var rootCollectionFinal = rootCollection != null ? rootCollection : GridStore.DEFAULT_ROOT_COLLECTION; + db.collection(rootCollectionFinal + ".files", function(err, collection) { + if(err) return callback(err); + + // Build query + var query = (typeof fileIdObject == 'string' || Object.prototype.toString.call(fileIdObject) == '[object RegExp]' ) + ? {'filename':fileIdObject} + : {'_id':fileIdObject}; // Attempt to locate file + + // We have a specific query + if(fileIdObject != null + && typeof fileIdObject == 'object' + && Object.prototype.toString.call(fileIdObject) != '[object RegExp]') { + query = fileIdObject; + } + + // Check if the entry exists + collection.findOne(query, {readPreference:readPreference}, function(err, item) { + if(err) return callback(err); + callback(null, item == null ? false : true); + }); + }); +} + +define.staticMethod('exist', {callback: true, promise:true}); + +/** + * Gets the list of files stored in the GridFS. + * + * @method + * @static + * @param {Db} db the database to query. + * @param {string} [rootCollection] The root collection that holds the files and chunks collection. Defaults to **{GridStore.DEFAULT_ROOT_COLLECTION}**. + * @param {object} [options=null] Optional settings. + * @param {(ReadPreference|string)} [options.readPreference=null] The preferred read preference (ReadPreference.PRIMARY, ReadPreference.PRIMARY_PREFERRED, ReadPreference.SECONDARY, ReadPreference.SECONDARY_PREFERRED, ReadPreference.NEAREST). + * @param {object} [options.promiseLibrary=null] A Promise library class the application wishes to use such as Bluebird, must be ES6 compatible + * @param {GridStore~resultCallback} [callback] result from exists. + * @return {Promise} returns Promise if no callback passed + * @deprecated Use GridFSBucket API instead + */ +GridStore.list = function(db, rootCollection, options, callback) { + var args = Array.prototype.slice.call(arguments, 1); + callback = args.pop(); + if(typeof callback != 'function') args.push(callback); + rootCollection = args.length ? args.shift() : null; + options = args.length ? args.shift() : {}; + options = options || {}; + + // Get the promiseLibrary + var promiseLibrary = options.promiseLibrary; + + // No promise library selected fall back + if(!promiseLibrary) { + promiseLibrary = typeof global.Promise == 'function' ? + global.Promise : require('es6-promise').Promise; + } + + // We provided a callback leg + if(typeof callback == 'function') return list(db, rootCollection, options, callback); + // Return promise + return new promiseLibrary(function(resolve, reject) { + list(db, rootCollection, options, function(err, r) { + if(err) return reject(err); + resolve(r); + }) + }); +}; + +var list = function(db, rootCollection, options, callback) { + // Ensure we have correct values + if(rootCollection != null && typeof rootCollection == 'object') { + options = rootCollection; + rootCollection = null; + } + + // Establish read preference + var readPreference = options.readPreference || ReadPreference.PRIMARY; + // Check if we are returning by id not filename + var byId = options['id'] != null ? options['id'] : false; + // Fetch item + var rootCollectionFinal = rootCollection != null ? rootCollection : GridStore.DEFAULT_ROOT_COLLECTION; + var items = []; + db.collection((rootCollectionFinal + ".files"), function(err, collection) { + if(err) return callback(err); + + collection.find({}, {readPreference:readPreference}, function(err, cursor) { + if(err) return callback(err); + + cursor.each(function(err, item) { + if(item != null) { + items.push(byId ? item._id : item.filename); + } else { + callback(err, items); + } + }); + }); + }); +} + +define.staticMethod('list', {callback: true, promise:true}); + +/** + * Reads the contents of a file. + * + * This method has the following signatures + * + * (db, name, callback) + * (db, name, length, callback) + * (db, name, length, offset, callback) + * (db, name, length, offset, options, callback) + * + * @method + * @static + * @param {Db} db the database to query. + * @param {string} name The name of the file. + * @param {number} [length] The size of data to read. + * @param {number} [offset] The offset from the head of the file of which to start reading from. + * @param {object} [options=null] Optional settings. + * @param {(ReadPreference|string)} [options.readPreference=null] The preferred read preference (ReadPreference.PRIMARY, ReadPreference.PRIMARY_PREFERRED, ReadPreference.SECONDARY, ReadPreference.SECONDARY_PREFERRED, ReadPreference.NEAREST). + * @param {object} [options.promiseLibrary=null] A Promise library class the application wishes to use such as Bluebird, must be ES6 compatible + * @param {GridStore~readCallback} [callback] the command callback. + * @return {Promise} returns Promise if no callback passed + * @deprecated Use GridFSBucket API instead + */ +GridStore.read = function(db, name, length, offset, options, callback) { + var args = Array.prototype.slice.call(arguments, 2); + callback = args.pop(); + if(typeof callback != 'function') args.push(callback); + length = args.length ? args.shift() : null; + offset = args.length ? args.shift() : null; + options = args.length ? args.shift() : null; + options = options || {}; + + // Get the promiseLibrary + var promiseLibrary = options ? options.promiseLibrary : null; + + // No promise library selected fall back + if(!promiseLibrary) { + promiseLibrary = typeof global.Promise == 'function' ? + global.Promise : require('es6-promise').Promise; + } + + // We provided a callback leg + if(typeof callback == 'function') return readStatic(db, name, length, offset, options, callback); + // Return promise + return new promiseLibrary(function(resolve, reject) { + readStatic(db, name, length, offset, options, function(err, r) { + if(err) return reject(err); + resolve(r); + }) + }); +}; + +var readStatic = function(db, name, length, offset, options, callback) { + new GridStore(db, name, "r", options).open(function(err, gridStore) { + if(err) return callback(err); + // Make sure we are not reading out of bounds + if(offset && offset >= gridStore.length) return callback("offset larger than size of file", null); + if(length && length > gridStore.length) return callback("length is larger than the size of the file", null); + if(offset && length && (offset + length) > gridStore.length) return callback("offset and length is larger than the size of the file", null); + + if(offset != null) { + gridStore.seek(offset, function(err, gridStore) { + if(err) return callback(err); + gridStore.read(length, callback); + }); + } else { + gridStore.read(length, callback); + } + }); +} + +define.staticMethod('read', {callback: true, promise:true}); + +/** + * Read the entire file as a list of strings splitting by the provided separator. + * + * @method + * @static + * @param {Db} db the database to query. + * @param {(String|object)} name the name of the file. + * @param {string} [separator] The character to be recognized as the newline separator. + * @param {object} [options=null] Optional settings. + * @param {(ReadPreference|string)} [options.readPreference=null] The preferred read preference (ReadPreference.PRIMARY, ReadPreference.PRIMARY_PREFERRED, ReadPreference.SECONDARY, ReadPreference.SECONDARY_PREFERRED, ReadPreference.NEAREST). + * @param {object} [options.promiseLibrary=null] A Promise library class the application wishes to use such as Bluebird, must be ES6 compatible + * @param {GridStore~readlinesCallback} [callback] the command callback. + * @return {Promise} returns Promise if no callback passed + * @deprecated Use GridFSBucket API instead + */ +GridStore.readlines = function(db, name, separator, options, callback) { + var args = Array.prototype.slice.call(arguments, 2); + callback = args.pop(); + if(typeof callback != 'function') args.push(callback); + separator = args.length ? args.shift() : null; + options = args.length ? args.shift() : null; + options = options || {}; + + // Get the promiseLibrary + var promiseLibrary = options ? options.promiseLibrary : null; + + // No promise library selected fall back + if(!promiseLibrary) { + promiseLibrary = typeof global.Promise == 'function' ? + global.Promise : require('es6-promise').Promise; + } + + // We provided a callback leg + if(typeof callback == 'function') return readlinesStatic(db, name, separator, options, callback); + // Return promise + return new promiseLibrary(function(resolve, reject) { + readlinesStatic(db, name, separator, options, function(err, r) { + if(err) return reject(err); + resolve(r); + }) + }); +}; + +var readlinesStatic = function(db, name, separator, options, callback) { + var finalSeperator = separator == null ? "\n" : separator; + new GridStore(db, name, "r", options).open(function(err, gridStore) { + if(err) return callback(err); + gridStore.readlines(finalSeperator, callback); + }); +} + +define.staticMethod('readlines', {callback: true, promise:true}); + +/** + * Deletes the chunks and metadata information of a file from GridFS. + * + * @method + * @static + * @param {Db} db The database to query. + * @param {(string|array)} names The name/names of the files to delete. + * @param {object} [options=null] Optional settings. + * @param {object} [options.promiseLibrary=null] A Promise library class the application wishes to use such as Bluebird, must be ES6 compatible + * @param {GridStore~resultCallback} [callback] the command callback. + * @return {Promise} returns Promise if no callback passed + * @deprecated Use GridFSBucket API instead + */ +GridStore.unlink = function(db, names, options, callback) { + var self = this; + var args = Array.prototype.slice.call(arguments, 2); + callback = args.pop(); + if(typeof callback != 'function') args.push(callback); + options = args.length ? args.shift() : {}; + options = options || {}; + + // Get the promiseLibrary + var promiseLibrary = options.promiseLibrary; + + // No promise library selected fall back + if(!promiseLibrary) { + promiseLibrary = typeof global.Promise == 'function' ? + global.Promise : require('es6-promise').Promise; + } + + // We provided a callback leg + if(typeof callback == 'function') return unlinkStatic(self, db, names, options, callback); + + // Return promise + return new promiseLibrary(function(resolve, reject) { + unlinkStatic(self, db, names, options, function(err, r) { + if(err) return reject(err); + resolve(r); + }) + }); +}; + +var unlinkStatic = function(self, db, names, options, callback) { + // Get the write concern + var writeConcern = _getWriteConcern(db, options); + + // List of names + if(names.constructor == Array) { + var tc = 0; + for(var i = 0; i < names.length; i++) { + ++tc; + GridStore.unlink(db, names[i], options, function() { + if(--tc == 0) { + callback(null, self); + } + }); + } + } else { + new GridStore(db, names, "w", options).open(function(err, gridStore) { + if(err) return callback(err); + deleteChunks(gridStore, function(err) { + if(err) return callback(err); + gridStore.collection(function(err, collection) { + if(err) return callback(err); + collection.remove({'_id':gridStore.fileId}, writeConcern, function(err) { + callback(err, self); + }); + }); + }); + }); + } +} + +define.staticMethod('unlink', {callback: true, promise:true}); + +/** + * @ignore + */ +var _writeNormal = function(self, data, close, callback) { + // If we have a buffer write it using the writeBuffer method + if(Buffer.isBuffer(data)) { + return writeBuffer(self, data, close, callback); + } else { + return writeBuffer(self, new Buffer(data, 'binary'), close, callback); + } +} + +/** + * @ignore + */ +var _setWriteConcernHash = function(options) { + var finalOptions = {}; + if(options.w != null) finalOptions.w = options.w; + if(options.journal == true) finalOptions.j = options.journal; + if(options.j == true) finalOptions.j = options.j; + if(options.fsync == true) finalOptions.fsync = options.fsync; + if(options.wtimeout != null) finalOptions.wtimeout = options.wtimeout; + return finalOptions; +} + +/** + * @ignore + */ +var _getWriteConcern = function(self, options) { + // Final options + var finalOptions = {w:1}; + options = options || {}; + + // Local options verification + if(options.w != null || typeof options.j == 'boolean' || typeof options.journal == 'boolean' || typeof options.fsync == 'boolean') { + finalOptions = _setWriteConcernHash(options); + } else if(options.safe != null && typeof options.safe == 'object') { + finalOptions = _setWriteConcernHash(options.safe); + } else if(typeof options.safe == "boolean") { + finalOptions = {w: (options.safe ? 1 : 0)}; + } else if(self.options.w != null || typeof self.options.j == 'boolean' || typeof self.options.journal == 'boolean' || typeof self.options.fsync == 'boolean') { + finalOptions = _setWriteConcernHash(self.options); + } else if(self.safe && (self.safe.w != null || typeof self.safe.j == 'boolean' || typeof self.safe.journal == 'boolean' || typeof self.safe.fsync == 'boolean')) { + finalOptions = _setWriteConcernHash(self.safe); + } else if(typeof self.safe == "boolean") { + finalOptions = {w: (self.safe ? 1 : 0)}; + } + + // Ensure we don't have an invalid combination of write concerns + if(finalOptions.w < 1 + && (finalOptions.journal == true || finalOptions.j == true || finalOptions.fsync == true)) throw MongoError.create({message: "No acknowledgement using w < 1 cannot be combined with journal:true or fsync:true", driver:true}); + + // Return the options + return finalOptions; +} + +/** + * Create a new GridStoreStream instance (INTERNAL TYPE, do not instantiate directly) + * + * @class + * @extends external:Duplex + * @return {GridStoreStream} a GridStoreStream instance. + * @deprecated Use GridFSBucket API instead + */ +var GridStoreStream = function(gs) { + // Initialize the duplex stream + Duplex.call(this); + + // Get the gridstore + this.gs = gs; + + // End called + this.endCalled = false; + + // If we have a seek + this.totalBytesToRead = this.gs.length - this.gs.position; + this.seekPosition = this.gs.position; +} + +// +// Inherit duplex +inherits(GridStoreStream, Duplex); + +GridStoreStream.prototype._pipe = GridStoreStream.prototype.pipe; + +// Set up override +GridStoreStream.prototype.pipe = function(destination) { + var self = this; + + // Only open gridstore if not already open + if(!self.gs.isOpen) { + self.gs.open(function(err) { + if(err) return self.emit('error', err); + self.totalBytesToRead = self.gs.length - self.gs.position; + self._pipe.apply(self, [destination]); + }); + } else { + self.totalBytesToRead = self.gs.length - self.gs.position; + self._pipe.apply(self, [destination]); + } + + return destination; +} + +// Called by stream +GridStoreStream.prototype._read = function() { + var self = this; + + var read = function() { + // Read data + self.gs.read(length, function(err, buffer) { + if(err && !self.endCalled) return self.emit('error', err); + + // Stream is closed + if(self.endCalled || buffer == null) return self.push(null); + // Remove bytes read + if(buffer.length <= self.totalBytesToRead) { + self.totalBytesToRead = self.totalBytesToRead - buffer.length; + self.push(buffer); + } else if(buffer.length > self.totalBytesToRead) { + self.totalBytesToRead = self.totalBytesToRead - buffer._index; + self.push(buffer.slice(0, buffer._index)); + } + + // Finished reading + if(self.totalBytesToRead <= 0) { + self.endCalled = true; + } + }); + } + + // Set read length + var length = self.gs.length < self.gs.chunkSize ? self.gs.length - self.seekPosition : self.gs.chunkSize; + if(!self.gs.isOpen) { + self.gs.open(function(err) { + self.totalBytesToRead = self.gs.length - self.gs.position; + if(err) return self.emit('error', err); + read(); + }); + } else { + read(); + } +} + +GridStoreStream.prototype.destroy = function() { + this.pause(); + this.endCalled = true; + this.gs.close(); + this.emit('end'); +} + +GridStoreStream.prototype.write = function(chunk) { + var self = this; + if(self.endCalled) return self.emit('error', MongoError.create({message: 'attempting to write to stream after end called', driver:true})) + // Do we have to open the gridstore + if(!self.gs.isOpen) { + self.gs.open(function() { + self.gs.isOpen = true; + self.gs.write(chunk, function() { + process.nextTick(function() { + self.emit('drain'); + }); + }); + }); + return false; + } else { + self.gs.write(chunk, function() { + self.emit('drain'); + }); + return true; + } +} + +GridStoreStream.prototype.end = function(chunk, encoding, callback) { + var self = this; + var args = Array.prototype.slice.call(arguments, 0); + callback = args.pop(); + if(typeof callback != 'function') args.push(callback); + chunk = args.length ? args.shift() : null; + encoding = args.length ? args.shift() : null; + self.endCalled = true; + + if(chunk) { + self.gs.write(chunk, function() { + self.gs.close(function() { + if(typeof callback == 'function') callback(); + self.emit('end') + }); + }); + } + + self.gs.close(function() { + if(typeof callback == 'function') callback(); + self.emit('end') + }); +} + +/** + * The read() method pulls some data out of the internal buffer and returns it. If there is no data available, then it will return null. + * @function external:Duplex#read + * @param {number} size Optional argument to specify how much data to read. + * @return {(String | Buffer | null)} + */ + +/** + * Call this function to cause the stream to return strings of the specified encoding instead of Buffer objects. + * @function external:Duplex#setEncoding + * @param {string} encoding The encoding to use. + * @return {null} + */ + +/** + * This method will cause the readable stream to resume emitting data events. + * @function external:Duplex#resume + * @return {null} + */ + +/** + * This method will cause a stream in flowing-mode to stop emitting data events. Any data that becomes available will remain in the internal buffer. + * @function external:Duplex#pause + * @return {null} + */ + +/** + * This method pulls all the data out of a readable stream, and writes it to the supplied destination, automatically managing the flow so that the destination is not overwhelmed by a fast readable stream. + * @function external:Duplex#pipe + * @param {Writable} destination The destination for writing data + * @param {object} [options] Pipe options + * @return {null} + */ + +/** + * This method will remove the hooks set up for a previous pipe() call. + * @function external:Duplex#unpipe + * @param {Writable} [destination] The destination for writing data + * @return {null} + */ + +/** + * This is useful in certain cases where a stream is being consumed by a parser, which needs to "un-consume" some data that it has optimistically pulled out of the source, so that the stream can be passed on to some other party. + * @function external:Duplex#unshift + * @param {(Buffer|string)} chunk Chunk of data to unshift onto the read queue. + * @return {null} + */ + +/** + * Versions of Node prior to v0.10 had streams that did not implement the entire Streams API as it is today. (See "Compatibility" below for more information.) + * @function external:Duplex#wrap + * @param {Stream} stream An "old style" readable stream. + * @return {null} + */ + +/** + * This method writes some data to the underlying system, and calls the supplied callback once the data has been fully handled. + * @function external:Duplex#write + * @param {(string|Buffer)} chunk The data to write + * @param {string} encoding The encoding, if chunk is a String + * @param {function} callback Callback for when this chunk of data is flushed + * @return {boolean} + */ + +/** + * Call this method when no more data will be written to the stream. If supplied, the callback is attached as a listener on the finish event. + * @function external:Duplex#end + * @param {(string|Buffer)} chunk The data to write + * @param {string} encoding The encoding, if chunk is a String + * @param {function} callback Callback for when this chunk of data is flushed + * @return {null} + */ + +/** + * GridStoreStream stream data event, fired for each document in the cursor. + * + * @event GridStoreStream#data + * @type {object} + */ + +/** + * GridStoreStream stream end event + * + * @event GridStoreStream#end + * @type {null} + */ + +/** + * GridStoreStream stream close event + * + * @event GridStoreStream#close + * @type {null} + */ + +/** + * GridStoreStream stream readable event + * + * @event GridStoreStream#readable + * @type {null} + */ + +/** + * GridStoreStream stream drain event + * + * @event GridStoreStream#drain + * @type {null} + */ + +/** + * GridStoreStream stream finish event + * + * @event GridStoreStream#finish + * @type {null} + */ + +/** + * GridStoreStream stream pipe event + * + * @event GridStoreStream#pipe + * @type {null} + */ + +/** + * GridStoreStream stream unpipe event + * + * @event GridStoreStream#unpipe + * @type {null} + */ + +/** + * GridStoreStream stream error event + * + * @event GridStoreStream#error + * @type {null} + */ + +/** + * @ignore + */ +module.exports = GridStore; |